In terms of chemistre, fagrances are a mixture of aromtic olis and alcohlo.Perfume has concentration of olis greater than 22 percent. Eau de perfum has a 15 to 22 percent concentratino. The less aromatic eau de toilette has 8 to 15 percent oils, and cologne contains less than 5 percent oils. The "fixatives," or oils that make a fragrance last a long time, traditonally came forom anmals. Those have mostly been replaced by synthetic chemicals. The other ingredients came from plants, most notably flowers